patch 9.0.0520: declaring a loop variable at the start of a block is clumsy

Problem:    Declaring a loop variable at the start of a block is clumsy.
Solution:   Declare the variable inside the loop in a few places to see if
            this works.
diff --git a/src/version.c b/src/version.c
index bc90293..60c0527 100644
--- a/src/version.c
+++ b/src/version.c
@@ -700,6 +700,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    520,
+/**/
     519,
 /**/
     518,